Sound amplifier



May 29, 1928.

O.R.PLATTER ETAL SOUND AMPLIFIER Filed March 30, 1927 2 Sheets-Sheet 1 a l 7 m H PM; r H 0.

May 29, 1928. 1,671,543

. O. R. PLATTER ET AL SOUND AMPLIFIER Fi led March 30, 1927 2 Sheets-Sheet 2 gwumfou 2i aruallzplaiier' flfasper TBa I] Patented May 29, 1928.

UNITED STATE s PATENT OFFICE.

ORVAL R. PLATTER AND JASPER '1. BALL, OF NORTH VERNON, INDIANA.

I I SOUND AMPLIFIER.

Application filed March 30, 1927. 2 Serial No. 1795191 Our invention relates to horns or sound amplifiers to be used with phonographs; wireless receiving sets, and the like, and it it an object of the inventionto provide a device of this character which will segregate and amplify thetone waves of the human voice and musical'instrume'nts and will emit such tone waves in a manner whereby they may be'clearly and distinctlyhearda'nd with pronounced modification of static and in- In the drawings reference character 10indicates a. sound box 11 a flared outlet'or' bell-mouth, and 12 a sound receiving and conveying tube or neck of tortuous shape and of constantly increasing .diameter from end to end.

The sound 'box'lO ispreferably formed of ply-wood or laminated wood structure and has its sides preferably formed integrally with the sides of the flared bell 11. The ends of the sound box are disposed in substantially parallel relation, and upon the inside of one of said ends is mounted a pyramid or cone-shaped resonator 13. The opposite end of the sound box' isprovided with an opening in which is disposed the large end of the tube 12 which conducts the sounds waves from a loud speaker unit or the like into the sound box.

The sound receiving and conveying tube 12 is formed of plastic resonant fibrous material and has its large end formed in communication with one end of the sound box from which it extends perpendicularly for a short distance and is doubled upon itself and extends along the side of the flared bellmouth 11 and is redoubled upon itself at the opposite end of the side. Theside of the bell-mouth 11 is provided with a curved tapered depression 14 in which the tube 12 is disposed thus providing a very compact arrangement. The small end of the tube or neck is disposed at the opposite end'of the sound box on the exterior of the same for attachment to a loud speaker unit or the like and the taper of said tube is of a general character which insures most satisfactory results.

The" sound box 10 is preferably provided with an extension 15 which forms in con-" junction with the lowerflared outlet 11 a support for the device by means of which the extremity of the outlet 11 may be supported in upright position.

An arcuate partition member 16 is disbox and such partition member 16 is disposed'edgewise across the end of the tube 12 and provides a substantially crescentposed within the upper portion of the sound shaped opening 17 into the upper portion of the sound box and "a larger circular opening in the lower sound box from which sound is emitted. A

' partition plate 18 of ply-wood or laminated substantially portion of the wood structure is disposed transversely within the bell-mouth 11 substantially at right anglesto and in engagement with the arcuate partition member 16 for dividing the a narrow rib 19 comprising a strip of woodor the like material which extends continuously. therethrough and serves the double bell-mouth 11 into two compartments for dividing and segregatingaportion of the purpose of strengthening the sound receiv--' mg andyconveying tube 12 and dividing the tones. This rib serves to secure the full tonal-scale and to bring in the booming base notes and is assisted in its function of the reflection of tone and multiplication of the frequency of the tone-waves of semi-circular ribs 20 relation within the upper 12. This combination of ribs reflects the by a plurality disposed in spaced tone waves in two directions as will be ob-' port on of the tube vious and gives a harmonious or uniform" circular motion which results in the segre gation of speech distinctly and naturally as well as musical instruments and the like which are classified and separated and are rendered recognizable when played in orchestras and the like. I

The tube 12 is provided with a plurality "of slots 21 adjacent its small end about which slots'is disposed a rubber ball 22 such construction being designed to reduce vibration and to modify static as well as to prevent to some extent cramping or distorting of tones.

In actualexperience it has been found that With our device one very disagreeable form of static, which is of an intermediate nature and comes in with a loud jarring sound and then fades away to return again in a few minutes, is muffled to a large extent and practically eliminated and that part which is not eliminated is made more of a tone than a noise.

It will be obvious to those skilled in the art that various changes may be made in our device without departing from the spirit of our invention, and we, therefore, do not limit ourselves to What is shown in the drawings and described in the specification, but.

2. A sound amplifier comprising a sound.

box having a truncated member extending from one side of the same, a tubular sound receiving element of increasing cross sectional area having itslarge end connected to said sound box and its intermediate portion disposed in a recess formed in one side of said truncated member, and. a supporting element at the bottom of said sound box forming with the lower extremity of'the truncated member a means for supporting the amplifier, substantially as set forth.

3. .A sound amplifier comprising a sound box havinga truncated member extending from one sideof the same, a tubular sound receiving element of increasing cross sectional area having its large end connected to said sound box and its intermediate portion disposed in a recess formed in one side of said truncated member, a supporting element at the bottom of said sound box forming with the lower extremity of the truncated member a means for supporting the amplifier, and a narrow rib disposed longitudinally within said tubular sound. receiving element, substantially as set forth.

4. A sound amplifier comprising a sound box having a truncated member extending from one side of the same, a tubular sound receiving element of increasing cross sectional area having its large end connected to said'sound box and its intermediate portion disposed in a recess formed in one side of said truncated member, a supporting element at the bottom of said sound box forming with the lower extremity of the truncated member a means for supporting the amplifier, and a plurality of transverse ribs disposed within said tubular sound receiving element, substantially as set forth.

5. A sound amplifier comprising a sound box having a truncated member extending from one side of the same, a tubular sound receiving element of increasing cross sectional area having its large end connected to said sound box and its intermediate portion disposed in a recess formed in one-side of. said truncated member, a supporting a element at the bottom of said sound box forming with the lower extremity of the truncatedjmember a means for supporting the amplifier, a narrow rib disposed longitudinally within said tubular sound receiving element, and a plurality of transverse ribs,

disposed within said tubular soundv receiving element substantially as set forth.

6. A sound amplifier comprising a hollow structure having a substantially rectangular portion and a flared mouth extending therefrom, a sound receiving tube of increasing diameter having its large end communicating with said sound box adjacent one side of the flared mouth, said receiving tube being formed of plasticmaterial and extending about said flared mouth andresting in a depression in the side of the same, substantially as set forth.

7 A sound amplifier comprising a hollow' structure having a substantially rectangular portion and a flared mouth extending therefrom, a sound receiving tube of increasing diameter having its large end communicating with said sound box adjacent one side of the flared mouth, said receiving tube being formed of plastic material and extending about said flared mouth and resting in a depression in the side of the same, and a res-. onator formedof a pyramid disposed in the sound box at the side opposite its connection with the receiving tube, substantially as set forth. V

8. A horn comprising a diverging end provided with an amplifying chamber at its small end, a sound conveying tube connected to said amplifying chamber at one side of the same and winding about said diverging end and disposed within a depression in the outer side of the same, and a pyramid-shaped resonating reflector within the amplify-. ing chamber, substantially as set forth.

9. A horn comprising a. diverging end provided with an amplifying chamber at its small end, a sound conveying tube connected to said amplifying chamber at one side of the same and Winding aboutsaid diverging end and disposed within a depression in the outer side of the same, a pyramid-shaped resonating reflector within the amplifying chamber, a partition member disposed in said diverging end, and a. second partition member engaging the edge of the first-mentioned partition member and extending into veying tube and a second partition member dividing said diverging end into two compartments and snugly fitting against the first-mentioned partition member, substantially as set forth.

In Witness whereof, We have hereunto set our hands at North Vernon, Indiana, this 26th day of March, A. D. nineteen hundred 0 and twenty-seven ORVAL R. PLATTER. JASPER T. BALL. 

